Re: Jumbo Frames?
On Wednesday 01 Feb 2006 08:29, mike wrote:
> ..... I could
> get anywhere from 100-117MB/sec. Which isn't a problem -
> theoretically, gigE can only give me 125MB/sec anyway... so
> 116-117MB/sec I think is really good, so I am happy now. :)
The figure you have is about right. Yes there are 8 bits in a byte, so you'd
expect 125MB; but because you're dealing with packets, and not a contiguous
bit stream {à la Spectrum cassette loading}, there are overheads -- every
packet has to have a header and footer, which count against the total.
By using bigger packets, you will have fewer headers and footers -- and so
improve the transmission rate.
BTW, RS232 serial comms {old-fashioned modems!} effectively uses one-byte
"packets", with a 2-bit overhead. This is why you have to divide by ten, not
eight, when converting bits to bytes in serial comms.
--
AJS
delta echo bravo six four at earthshod dot co dot uk
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